Other Comprehensive Income (Schedule of OCI) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Jun. 29, 2019	Mar. 30, 2019	Jun. 27, 2020	Jun. 29, 2019
Before-Tax Amount:
Amortization of prior service cost	$ 8		$ 9		$ 16	$ 18
Amortization of actuarial loss	854		1,147		1,708	2,293
Total defined benefit pension plans	862		1,156		1,724	2,311
Foreign currency translation	20,852		16,652		(45,035)	11,259
Other Comprehensive income (loss)	20,911		22,853		(42,771)	15,681
Tax (Expense) or Benefit:
Amortization of prior service cost	(2)		(2)		(4)	(5)
Amortization of actuarial loss	(213)		(295)		(425)	(589)
Total defined benefit pension plans	(215)		(297)		(429)	(594)
Foreign currency translation	(713)		(326)		(62)	181
Other Comprehensive income (loss)	(1,582)		(2,062)		(633)	(855)
Net-of-Tax Amount:
Amortization of prior service cost	6		7		12	13
Amortization of actuarial loss	641		852		1,283	1,704
Total defined benefit pension plans	647		859		1,295	1,717
Foreign currency translation	20,139	$ (65,236)	16,326	$ (4,886)	(45,097)	11,440
Net current-period other comprehensive income	19,329		20,791		(43,404)	14,826
Corn Option [Member]
Before-Tax Amount:
Loss (gain) reclassified to net income	639		(37)		939	(37)
Gain (loss) activity recognized in other comprehensive loss	1,768		67		1,649	67
Total swap derivatives	2,407		30		2,588	30
Tax (Expense) or Benefit:
Loss (gain) reclassified to net income	(160)		10		(235)	10
Gain (loss) activity recognized in other comprehensive loss	(443)		(18)		(413)	(18)
Total swap derivatives	(603)		(8)		(648)	(8)
Net-of-Tax Amount:
Loss (gain) reclassified to net income	479		(27)		704	(27)
Gain (loss) activity recognized in other comprehensive loss	1,325		49		1,236	49
Total swap derivatives	1,804	136	22		1,940	22
Heating Oil Swaps And Options [Member]
Before-Tax Amount:
Gain (loss) activity recognized in other comprehensive loss	(11,921)		2,874		2,573	2,874
Total swap derivatives	(11,921)		2,874		2,573	2,874
Tax (Expense) or Benefit:
Gain (loss) activity recognized in other comprehensive loss	2,981		(741)		(643)	(741)
Total swap derivatives	2,981		(741)		(643)	(741)
Net-of-Tax Amount:
Gain (loss) activity recognized in other comprehensive loss	(8,940)		2,133		1,930	2,133
Total swap derivatives	(8,940)		2,133		1,930	2,133
Foreign Exchange Contract [Member]
Before-Tax Amount:
Loss (gain) reclassified to net income	(4,835)		287		(5,247)	287
Gain (loss) activity recognized in other comprehensive loss	13,546		1,854		626	(1,080)
Total swap derivatives	8,711		2,141		(4,621)	(793)
Tax (Expense) or Benefit:
Loss (gain) reclassified to net income	1,176		(111)		1,305	(111)
Gain (loss) activity recognized in other comprehensive loss	(4,208)		(579)		(156)	418
Total swap derivatives	(3,032)		(690)		1,149	307
Net-of-Tax Amount:
Loss (gain) reclassified to net income	(3,659)		176		(3,942)	176
Gain (loss) activity recognized in other comprehensive loss	9,338		1,275		470	(662)
Total swap derivatives	5,679	(9,151)	1,451	(1,937)	$ (3,472)	$ (486)
Accumulated Other Comprehensive Loss
Net-of-Tax Amount:
Foreign currency translation	20,779	(65,147)	17,797	(6,645)
Accumulated Other Comprehensive Loss | Corn Option [Member]
Net-of-Tax Amount:
Total swap derivatives	1,804	136	22
Accumulated Other Comprehensive Loss | Foreign Exchange Contract [Member]
Net-of-Tax Amount:
Total swap derivatives	$ 5,679	$ (9,151)	$ 1,451	$ (1,937)